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The Goodman 10135604 Relay is a genuine OEM switching relay for the WGHP4448AAD heat pump condenser. The relay energizes a load circuit — typically the condenser fan or an auxiliary control path — when its coil is signaled by the control board or thermostat. When the relay's contacts pit or its coil fails, you'll see no-cool, no-fan, or chattering symptoms even though the rest of the system tests good.
The OEM 10135604 matches the exact coil voltage, contact rating, and terminal layout the WGHP4448AAD was wired for. Generic relays may carry a different coil voltage or pole configuration, forcing rewiring and risking under-rated contacts that weld shut. Genuine Goodman drops in with no wiring changes and the correct switching capacity.
Moderate. Disconnect power, photograph the existing wiring, transfer the spade terminals one at a time to the new relay, and confirm coil/contact orientation. Most techs complete it in 15–20 minutes. Basic electrical comfort and a multimeter are recommended to verify the failure first.
Always kill power at the disconnect before opening the control panel. Direct OEM replacement for the WGHP4448AAD.